Ruby-on-rails Rails has_many ：通过嵌套形式

Rails has_many :through nested form

提问by Wanderer

I have just jumped into has_many :throughassociation. I'm trying to implement the ability to save data for all 3 tables (Physician, Patientand association table) through a single form.

我刚刚加入了has_many :through协会。我正在尝试实现通过单个表单保存所有 3 个表（Physician,Patient和关联表）的数据的能力。

My migrations:

我的迁移：

class CreatePhysicians < ActiveRecord::Migration
  def self.up
    create_table :physicians do |t|
      t.string :name
      t.timestamps
    end
  end
end

class CreatePatients < ActiveRecord::Migration
  def self.up
    create_table :patients do |t|
      t.string :name
      t.timestamps
    end
  end
end

class CreateAppointments < ActiveRecord::Migration
  def self.up
    create_table :appointments do |t|
      t.integer :physician_id
      t.integer :patient_id
      t.date :appointment_date
      t.timestamps
    end
  end
end

My models:

我的模型：

class Patient < ActiveRecord::Base
  has_many :appointments
  has_many :physicians, :through => :appointments
  accepts_nested_attributes_for :appointments
  accepts_nested_attributes_for :physicians
end
class Physician < ActiveRecord::Base
  has_many :appointments
  has_many :patients, :through => :appointments
  accepts_nested_attributes_for :patients
  accepts_nested_attributes_for :appointments
end
class Appointment < ActiveRecord::Base
  belongs_to :physician
  belongs_to :patient
end

My controller:

我的控制器：

def new
    @patient = Patient.new
    @patient.physicians.build
    @patient.appointments.build
end

My view (new.html.rb):

我的观点（new.html.rb）：

<% form_for(@patient) do |patient_form| %>
  <%= patient_form.error_messages %>
  <p>
    <%= patient_form.label :name, "Patient Name" %>
    <%= patient_form.text_field :name %>
  </p>
  <%  patient_form.fields_for :physicians do |physician_form| %>
    <p>
      <%= physician_form.label :name, "Physician Name" %>
      <%= physician_form.text_field :name %>
    </p>
 <% end %>

  <p>
    <%= patient_form.submit 'Create' %>
  </p>
<% end %>

<%= link_to 'Back', patients_path %>

I'm able to create a new Patient, Physicianand associated record for an Appointment, but now I want to have field for appointment_datetoo in form. Where should I place fields for Appointments and what changes are required in my controller? I tried googling and tried this, but got stuck in some or other error implementing it.

我能创造一个新的Patient，Physician一个和相关的记录Appointment，但现在我想有字段appointment_date太形式。我应该在哪里放置Appointments 的字段以及我的控制器需要哪些更改？我尝试谷歌搜索并尝试了这个，但在实现它时遇到了一些或其他错误。

回答by guy8214

Ok, this little bugger of a question stumped me for a few hours, so I'm going to post my working solution on here in hopes it shaves some time for peeps. This is for Rails 4.0 and Ruby 2.0. This also overcame a "symbol to integer conversion" issue I had.

好吧，这个问题的小家伙让我难住了几个小时，所以我将在这里发布我的工作解决方案，希望它可以节省一些时间来窥视。这适用于 Rails 4.0 和 Ruby 2.0。这也克服了我遇到的“符号到整数转换”的问题。

Models:

楷模：

class Patient < ActiveRecord::Base 
  has_many :appointments
  has_many :physicians, :through: :appointments
  accepts_nested_attributes_for :appointments
end 

class Appointment < ActiveRecord::Base
  belongs_to :physician 
  belongs_to :patient
  accepts_nested_attributes_for :physician
end

class Physicians < ActiveRecord::Base
  has_many :appointments
  has_many :patients, through: :appointments
end

Controller:

控制器：

def new
  @patient= Patient.new 
  @appointments = @patient.appointments.build
  @physician = @appointments.build_physician 
end

def create
  Patient.new(patient_params)
end


def patient_params
   params.require(:patient).permit(:id, appointments_attributes: [:id, :appointment_time, physician_attributes: [:id ] )
end

View

看法

<% form_for(@patient) do |patient_form| %>
  <%= patient_form.error_messages %>
  <p>
    <%= patient_form.label :name, "Patient Name" %>
    <%= patient_form.text_field :name %>
  </p>

  <% patient_form.fields_for :appointments do |appointment_form| %>
    <p>
      <%= appointment_form.label :appointment_date, "Appointment Date" %>
      <%= appointment_form.date_field :appointment_date %>
    </p>

    <% appointment_form.fields_for :physician do |physician_form| %>
      <p>
        <%= physician_form.label :name, "Physician Name" %>
        <%= physician_form.text_field :name %>
      </p>
    <% end %>
  <% end %>

  <p>
    <%= patient_form.submit 'Create' %>
  </p>
<% end %>

<%= link_to 'Back', patients_path %>

回答by ctilley79

"i got it working. I just changed models as follows" : quoted from Shruti in the comments above

“我让它工作了。我只是按如下方式更改了模型”：在上面的评论中引用了 Shruti

class Patient < ActiveRecord::Base 
  has_many :appointments, :dependent => :destroy 
  has_many :physicians, :through => :appointments
  accepts_nested_attributes_for :appointments
end 

class Appointment < ActiveRecord::Base
  belongs_to :physician 
  belongs_to :patient
  accepts_nested_attributes_for :physician
end

回答by Andrew K Kirk

Your patient class accepts nested attributes for both physicians and appointments. Try adding another fields_formethod for appointment.

您的患者类接受医生和预约的嵌套属性。尝试添加另fields_for一种约会方法。

<% form_for(@patient) do |patient_form| %>
  <%= patient_form.error_messages %>
  <p>
    <%= patient_form.label :name, "Patient Name" %>
    <%= patient_form.text_field :name %>
  </p>

  <% patient_form.fields_for :physicians do |physician_form| %>
    <p>
      <%= physician_form.label :name, "Physician Name" %>
      <%= physician_form.text_field :name %>
    </p>
  <% end %>

  <% patient_form.fields_for :appointments do |appointment_form| %>
    <p>
      <%= appointment_form.label :appointment_date, "Appointment Date" %>
      <%= appointment_form.date_field :appointment_date %>
    </p>
  <% end %>

  <p>
    <%= patient_form.submit 'Create' %>
  </p>
<% end %>

<%= link_to 'Back', patients_path %>